MP2497GN-A [MPS]
3A, 50V, 100kHz Step-Down Converter with Programmable Output OVP Threshold;
| 型号： | MP2497GN-A |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 3A, 50V, 100kHz Step-Down Converter with Programmable Output OVP Threshold |
| 文件： | 总14页 (文件大小：606K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP2497-A
3A, 50V, 100kHz Step-Down Converter
with Programmable Output OVP Threshold
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP2497-A is a monolithic step-down
switch mode converter with a programmable
output current limit. The MP2497-A is the high
efficiency version of MP2497. It has fast
switching speed thus the switching loss is
greatly reduced. It achieves 3A continuous
output current over a wide input supply range
with excellent load and line regulation. An
internal 2-4ms soft start prevents inrush current at
turning on. And it is capable of providing output
line drop compensation.
Wide 4.5V to 50V Operating Input Range
Programmable Output Over Voltage
Protection
Output Adjustable from 0.8V to 25V
0.15Ω Internal Power MOSFET Switch
Internal 4ms Soft Start
Stable with Low ESR Output Ceramic
Capacitors
Fixed 100kHz Frequency
Fast Switching Speed
Thermal Shutdown
Fault condition protection includes hiccup current
limit and short circuit protection, programmable
output over voltage protection and thermal
shutdown.
Output Line Drop Compensation
Hiccup Circuit Limit and Short Circuit
Protection
Available in SOIC8E Package
The MP2497-A requires a minimum number of
readily available standard external components.
The MP2497-A is available in SOIC8E
package.
APPLICATIONS
USB Power Supplies
Automotive Cigarette Lighter Adapters
Power Supply for Linear Chargers
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
R6
Efficiency vs.
Output Current
L1
Rsense
C
3
C4
C
10
C6
95
C
2
BST
SW
VOUT
+
VIN
C5
VIN
90
85
80
75
70
65
60
Diode
C1
C11
OVP
GND
R
3
R
4
V
=12V
IN
MP2497-A
GND
V
=24V
IN
ISP
ISN
C
10nF
7
R
R
7
5
GND
FB
C
150pF
9
V
=50V
IN
C8
10nF
R
1
R
2
0.1 0.5 0.9 1.3 1.7 2.1 2.5 2.9
OUTPUT CURRENT(A)
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number
MP2497GN-A*
Package
SOIC8E
Top Marking
MP2497-A
* For Tape & Reel, add suffix –Z (e.g. MP2497GN-A–Z);
PACKAGE REFERENCE
SOIC8E
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
SOIC8E ..................................50...... 10... C/W
θJA
θJC
Input Voltage VIN .......................................... 60V
ISN, VISP ..............................................0V to 25V
|VISN -VISP| ...........................................0V to 0.4V
V
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-to-
ambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
V
V
SW........................................-0.3V to VIN + 0.3V
BST ................................................... VSW + 6.5V
All Other Pins...............................-0.3V to +6.5V
Junction Temperature...............................150C
Lead Temperature ....................................260C
Storage Temperature............... -65C to +150C
(2)
Continuous Power Dissipation (TA = +25°C)
3) The device is not guaranteed to function outside of its
operating conditions.
SOIC8E...................................................... 2.5W
4) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions (3)
Input Voltage VIN ..............................4.5V to 50V
Output Voltage VOUT (VIN>26.5V) .....0.8V to 25V
Output Voltage VOUT (VIN<=26.5V)......................
.........................................0.8V to (VIN–1.5)V
Operating Junction Temp. (TJ). -40°C to +125°C
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
2
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25C, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
Max
Units
0.78
0.8
0.82
TA=+25°C 4.5V VIN 50V
Feedback Voltage
Feedback Bias Current
VFB
V
TA=-40°C to +85°C 4.5V
VIN 50V
0.775
1.10
0.8
10
0.825
1.36
IBIAS(FB)
VFB = 0.8V
nA
V
Output Over Voltage
Reference
VOVREF
IBIAS(OVP)
RDS(ON)
1.23
TA=-40C to +85C
Input Bias Current (OVP)
Switch On Resistance
VOVP=1.23V
0.1
μA
0.15
Ω
Current Limit(5)
Duty Cycle=10%
VFB = 0.6V
5
100
4.5
100
3
A
kHz
V
Oscillator Frequency
Boot-Strap Voltage
Minimum On Time(5)
SW Rising Edge(5)
SW Falling Edge(5)
fSW
VBST - VSW
tON
80
120
ns
ns
ns
tRISE
tFALL
3
Under Voltage Lockout Threshold
Rising
2.9
15
3.4
200
20
3.9
25
V
Under Voltage Lockout Threshold
Hysteresis
mV
Load Line Compensation
Gain
GLLC
VISP-VISN=100mV, check IFB
μA/V
Current Sense Voltage
VISP –VISN VISP, VISN 0.5–15V
IBIAS (ISN,ISP) VISP, VISN 0.5–15V
VOVP = 0V, VFB = 1V
90
-1
100
-0.5
1.2
110
+1
mV
μA
Input Bias Current (ISN, ISP)
Supply Current (Quiescent)
1.5
mA
Thermal Shutdown(5)
150
30
°C
°C
Thermal Shutdown
Hysteresis(5)
Notes:
5) Guaranteed by design.
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
3
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
TYPICAL CHARACTERISTICS
C1=220μF, C2=2.2μF, C3=100μF, C4=22μF, L=33μH, RSENSE=33mΩ, TA=25ºC，unless otherwise
noted.
Output Line Drop
Compensation
Loop Gain with
Phase Margin
Efficiency vs.
Output Current
V
=12V, V
=
5V, I =3A
IN
OUT
OUT
Resistor Load
5.02
5
95
90
85
80
75
70
65
60
80
60
200
150
100
50
Phase
V
=12V
IN
40
V
=8V
IN
4.98
4.96
4.94
4.92
4.9
20
V
=12V
IN
V
=24V
V
=24V
IN
IN
0
0
Gain
V
=36V
IN
-20
-40
-60
-80
-50
-100
-150
-200
V
=50V
IN
V
=50V
IN
0.1
1
10
100
1000
0.1 0.5 0.9 1.3 1.7 2.1 2.5 2.9
OUTPUT CURRENT(A)
0
0.5
1
1.5
2
(A)
2.5
3
3.5
I
FREQUENCY(kHz)
OUT
Load Regulation
Connect ISP, ISN to GND
V
vs. Temperature
FB
V
=12V
IN
0.804
0.802
0.8
4.99
4.985
4.98
V
=50V
IN
4.975
4.97
V
=12V
IN
0.798
0.796
0.794
0.792
4.965
4.96
V
=24V
2.5
IN
4.955
4.95
0
0.5
1
1.5
2
3
3.5
-50 -20 10 40 70 100 130
I
(A)
OUT
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
4
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
C1=220μF, C2=2.2μF, C3=100μF, C4=22μF, L=33μH, RSENSE=33mΩ, TA=25ºC，unless otherwise
noted.
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
PIN FUNCTIONS
Package
Pin #
Name
Description
Supply Voltage. The MP2497-A operates from a +4.5V to +50V unregulated input. CIN is
needed to prevent large voltage spikes from appearing at the input. Put CIN as close to
the IC as possible. It is the drain of the internal power device and power supply for the
whole chip.
1
2
3
VIN
Ground. This pin is the voltage reference for the regulated output voltage. For this reason
care must be taken in its layout. This node should be placed outside of the D1 to CIN
ground path to prevent switching current spikes from inducing voltage noise into the part.
Connect exposed pad to GND plane for optimal thermal performance.
GND,
Exposed
Pad
Feedback. An external resistor divider from the output to GND tapped to the FB pin sets
the output voltage. To prevent current limit run away during a short circuit fault condition
the frequency-fold-back comparator lowers the oscillator frequency when the FB voltage
is below 250mV.
FB
Output Over Voltage Protection. Connect OVP to the center point of an external resistor
divider from output to GND. The OVP reference is 1.23V.
4
5
6
OVP
ISN
ISP
Negative Current Sense Input. It is used for load current limiting and output line drop
compensation.
Positive Current Sense Input. It is used for load current limiting and output line drop
compensation.
Bootstrap. This capacitor is needed to drive the power switch’s gate above the supply
voltage. It is connected between SW and BST pins to form a floating supply across the
power switch driver. An on-chip regulator is used to charge up the external boot-strap
capacitor. If the on-chip regulator is not strong enough, one optional diode can be
connected from IN or OUT to charge the external boot-strap capacitor.
7
8
BST
SW
Switch Output. It is the source of power device.
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
6
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
BLOCK DIAGRAM
CURRENT SENSE
AMPLIFIER
63mΩ
Σ
REGULATOR
REFERENCE
RAMP
REGULATOR
OSCILLATOR
DRIVER
RSENSE
CLK
IN
PWM
COMPARATOR
6.2uA
200mV
600mV
Hiccup
Current Limit
RS1
RS2
X 6
R1
6pF
10000kΩ
R2
72.8pF
2483kΩ
10pF
SS Circuit
ERRPR
AMPLIFIER
800mV
1.23V
400kΩ
OVP
COMPARATOR
Figure 1—Functional Block Diagram
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
7
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
Hiccup Mode Current Limit Protection
OPERATION
Main Control Loop
The MP2497-A is a current mode buck
regulator. That is, the EA output voltage is
proportional to the peak inductor current.
The output current information for current limit
protection is sensed via the ISP and ISN pins.
The sense voltage limit threshold is set at
100mV. MP2497-A has hiccup over current
limit function. Once the VSENSE exceeds the
100mV, the current limit loop will turn off high
side switch immediately. Meanwhile, internal
soft start circuit will be reset after FB is lower
than 0.3V, and then the high side switch turns
on and MP2497-A restarts with a full soft start.
This hiccup process is repeated until the fault is
removed. And, current limit value can be
programmed to be lower by internal current
source and external resistors connected to ISN
and ISP pins, when output voltage is lower than
200mV. Then, the average short circuit current
can be greatly reduced.
At the beginning of a cycle SW is off; the Error
Amplifier output voltage is higher than the
Current Sense Amplifier output. The rising edge
of the 100kHz CLK signal sets the RS Flip-Flop.
Its output turns on SW thus connecting the SW
pin and inductor to the input supply.
The increasing inductor current is sensed and
amplified by the Current Sense Amplifier. Ramp
Compensation is summed to Current Sense
Amplifier output and compared to the Error
Amplifier output by the PWM Comparator.
When the Current Sense Amplifier plus Slope
Compensation signal exceeds the Error
Amplifier output voltage, the RS Flip-Flop is
reset and the MP2497-A reverts to its initial SW
off state.
Output Over Voltage Protection
The MP2497-A has output over voltage
protection. The OVP reference 1.23V is on the
positive input of the OVP comparator. The
output voltage is fed to OVP pin through an
external resistor divider. If the voltage on OVP
pin is higher than 1.23V, the high side switch
will be turned off immediately and part will be
lathed off after a timer delay.
If the Current Sense Amplifier plus Slope
Compensation signal does not exceed the
COMP voltage, then the falling edge of the CLK
resets the Flip-Flop.
The output of the Error Amplifier integrates the
voltage difference between the feedback and
the reference. The polarity is such that an FB
pin voltage is lower than 0.8V increases the EA
output voltage. Since the EA output voltage is
proportional to the peak inductor current, an
increase in its voltage increases current
delivered to the output. An external Schottky
Diode (D1) carries the inductor current when
SW is off.
Output Line Drop Compensation
If the trace from MP2497-A output terminator to
the load is too long, there will be a voltage drop
on the long trace which is variable with load
current. MP2497-A is capable of compensating
the output voltage drop to keep a constant
voltage at load, whatever the load current is.
The output voltage is compensated by feeding
a current to the top feedback resistance R1.
The load line compensation gain can be
programmed according to RSENSE and RTRACE
(Figure 2) values.
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
8
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
APPLICATION INFORMATION
In the formula above, RSENSE is known. And
Setting the Output Line Drop Compensation
RTRACE can be tested or evaluated. So, we can
select a proper top feedback resistor R1
according to the RTRACE and RSENSE to
compensate the output line voltage drop.
Figure 2 shows the block of output line drop
compensation.
If the trace to the load is long, there is a voltage
drop between VOUT and VLOAD. VOUT (voltage at
output terminator) is not equal to VLOAD(voltage
at load). The voltage drop can be described by:
(1)
VDROP IOUT RTRACE
Where, the RTRACE is the resistance of the
output line. (RTRACE RTRACE1 RTRACE2
)
Then, the VLOAD is:
(2)
VLOAD VOUT IOUT RTRACE
To keep an accurate and constant load voltage,
the output line drop compensation is necessary.
MP2497-A offers a compensation method, by
adjusting the FB voltage slightly according to
the load current.
The relation between VOUT and VFB can be
described by:
VOUT VFB VFB IOUT RSENSE 6
(3)
R1
R2
400k
Where, VFB is 0.8V.
Then, the VOUT can be calculated by:
IOUT RSENSE 6R1
R1
R2
(4)
VOUT (1
)0.8V
FIGURE 2—OUTPUT LINE DROP
COMPENSATION
400k
The VLOAD is determined by:
Setting the Output Voltage
IOUT RSENSE 6R1
400k
R1
R2
The external resistor divider is used to set the
output voltage (see the typical application circuit
on the front page). The feedback resistor R1 is
decided by output line drop compensation. R2
is then given by:
VLOAD (1
)0.8V
(5)
IOUT RTRACE
To maintain the VLOAD is not variable with load
current. The equation below should be satisfied:
R1
VOUT
0.8V
R2
(8)
IOUT RSENSE 6R1
(6)
IOUT RTRACE
1
400k
Simplify the formula above, we can get:
RTRACE 400k
R1
(7)
6RSENSE
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
9
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
R3
VOVP
Selecting the Inductor
(11)
R4
(k)
A 10µH to 47µH inductor with a DC current
rating of at least 25% percent higher than the
maximum load current is recommended for
most applications. For highest efficiency, the
inductor DC resistance should be less than
200mꢀ. For most designs, the inductance value
can be derived from the following equation.
1
VOVREF
Where, VOVREF is the OVP reference, 1.23V.
OVP is over voltage protection threshold.
V
Setting the Current Limit
The hiccup current limit can be set by the DC
resistance (DCR) of the inductor, as shown in
Figure 3a.
VOUT (V VOUT
)
IN
L
(9)
V IL fOSC
IN
For more accurate sensing, use a more
accurate sense resistor.
Where ΔIL is the inductor ripple current.
Choose inductor current ripple to be
approximately 30% of the maximum load
current, 3A. The maximum inductor peak
current is:
In Figure 3a, the output current limit is set as:
100mV
(12)
IOUT _L
DCR
Where, DCR is the DC resistance of the
inductor winding. Ra and Ca is a low pass filter.
IL
2
IL(MAX) ILOAD
(10)
In Figure 3b, the output current limit is set as:
100mV
Under light load conditions below 100mA, larger
inductance is recommended for improving
efficiency.
(13)
IOUT _L
RSENSE
Selecting the Input Capacitor
The input capacitor reduces the surge current
drawn from the input and also the switching
noise from the device. The input capacitor
impedance at the switching frequency should
be less than the input source impedance to
prevent high frequency switching current from
passing to the input. Ceramic capacitors with
X5R
or
X7R
dielectrics
are
highly
recommended because of their low ESR and
small temperature coefficients. For most
applications, a 4.7µF capacitor is sufficient.
Selecting the Output Capacitor
The output capacitor keeps output voltage small
and ensures regulation loop stability. The
output capacitor impedance should be low at
the switching frequency. Ceramic capacitors
with X5R or X7R dielectrics are recommended.
Setting the Output OVP Threshold
The output OVP threshold is set by connecting
an external resistor divider (R3, R4 see the
typical application circuit on the front page) at
OVP pin. Choose R3 to be 39kꢀ for lower
power dissipation. Then, R4 is given by:
Figure 3—Current Sensing Methods
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
10
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
Programming the Short Circuit Current Limit
4) Route SW away from sensitive analog
areas such as FB.
The hiccup current limit at output short
condition can be programmed to be lower by
external resisters (RS1, RS2, RS1=RS2), as shown
in figure 4.
5) Connect IN, SW, and especially GND
respectively to a large copper area to cool
the chip to improve thermal performance
and long-term reliability.
When output voltage is lower than 200mV, the
current limit is described by:
SW
(14)
IOUT _ SL RSENSE 6.2A RS1 100mV
GND
L1
D2
The current limit at output short condition is:
100mV 6.2A RS1
(15)
IOUT _ SL
RSENSE
C6
R6
1
2
3
4
8
7
6
5
SW
BST
ISP
VIN
GND
FB
R7
R5
RSENSE
OVP
ISN
R12
C10
C4
R4
+
C3
C5
RS1
RS2
VIN
GND
VOUT
Top Layer
6.2uA
200mV
Figure 4—Short Circuit Current Limit
PCB Layout Guide
PCB layout is very important to achieve stable
operation. It is highly recommended to duplicate
EVB layout for optimum performance.
If change is necessary, please follow these
guidelines and take Figure 5 for reference.
1) Keep the path of switching current short
and minimize the loop area formed by Input
cap, high-side MOSFET and external
switching diode.
Bottom Layer
Figure 5—PCB Layout
2) Bypass ceramic capacitors are suggested
to be put close to the VIN Pin.
3) Ensure all feedback connections are short
and direct. Place the feedback resistors
and compensation components as close to
the chip as possible.
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
11
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
Design Example
External Bootstrap Diode
Below is a design example following the
application guidelines for the specifications:
It is recommended that an external bootstrap
diode be added when the system has a 5V
fixed input or the power supply generates a 5V
output. This helps improve the efficiency of the
regulator. The bootstrap diode can be a low
cost one such as IN4148 or BAT54.
VIN
VOUT
VOVP
FSW
8 to 50V
5V
6V
100kHz
3A
IOUT-L
This diode is also recommended for high duty
V
OUT
The detailed application schematic is shown in
Figure 7. The typical performance and circuit
waveforms have been shown in the Typical
Performance Characteristics section. For more
possible applications of this device, please refer
to related Evaluation Board Data Sheets.
V
cycle operation (when
>65%) and high
I N
output voltage (VOUT>12V) applications.
Figure 6—External Bootstrap Diode
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
12
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
Figure 7—Detailed Application Schematic
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
13
MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER
PACKAGE INFORMATION
SOIC8E (EXPOSED PAD)
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP2497-A Rev. 1.0
5/30/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
14
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36V, 3A Max, High-Efficiency, Synchronous, Step-Down Converter with Output Line Drop Compensation
MPS
MP2499MGQB
36V, 3A Max, High-Efficiency, Synchronous, Step-Down Converter with Output Line Drop Compensation
MPS
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